Thread: Retrieving info from a file...

Hi, I'm making an encryption program, not a very serious one really, but still I'm doing one. I'm having a problem though. I ask the user to input a string, and depending on what they want to call the file it is to be saved to, the length of the string it will encrypt it like:

Code:

for (int w=0; w<len; w++)
{
int BIT = sign*(w*(t*(42)));
fprintf(fp, "%c", MESSAGE[w]+BIT);
t++;
system ("CLS");
sign=-sign;
}
qu++;

something like that anyways. BIT is by what the characters deviate. Anyways, sometimes it puts a new line character in the encrypted codeword and when I try do decode it, it works up till that point. here's how I decode it:

Code:

for (int doubleu=0; doubleu<LEN; doubleu++)
{
int bit=sign*(doubleu*(T*(42)));
fscanf(FP, "%c", message[doubleu]+bit;
T++;
system ("CLS");
doubleu++;
sign=-sign;
}

this isn't exactly it, I can't find it on file, but if the file it creates, the one fp points to, has a new line in it, it won't let me decode the rest of it ...

You'd be better off with fgetc and fputc, rather than fscanf and fprintf.

Encode:
ch = MESSAGE[w];
ch += BIT;
fputc( ch, fp );

Decode:
ch = fgetc( fp );
ch -= BIT;
MESSAGE[w] = ch;

Decode is just the reverse of encode.

well, excatly i belive in what Salem say its better to use fgetc rather than fprintf/fscanf. as u wanted to get the new line chr as well which could actualy done by with these two fucntion fgetc and fputc which would eventually work fine for you case

ssharish2005